1; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py 2; RUN: llc -mtriple=aarch64-linux-gnu -verify-machineinstrs -o - %s | FileCheck %s 3; LSR used to pick a sub-optimal solution due to the target responding 4; conservatively to isLegalAddImmediate for negative values. 5 6declare void @foo(i32) 7 8define void @test(i32 %px) { 9; CHECK-LABEL: test: 10; CHECK: // %bb.0: // %entry 11; CHECK-NEXT: str x30, [sp, #-32]! // 8-byte Folded Spill 12; CHECK-NEXT: stp x20, x19, [sp, #16] // 16-byte Folded Spill 13; CHECK-NEXT: .cfi_def_cfa_offset 32 14; CHECK-NEXT: .cfi_offset w19, -8 15; CHECK-NEXT: .cfi_offset w20, -16 16; CHECK-NEXT: .cfi_offset w30, -32 17; CHECK-NEXT: subs w8, w0, #1 18; CHECK-NEXT: mov w19, w0 19; CHECK-NEXT: csel w20, wzr, w8, lt 20; CHECK-NEXT: b .LBB0_2 21; CHECK-NEXT: .LBB0_1: // %for.inc 22; CHECK-NEXT: // in Loop: Header=BB0_2 Depth=1 23; CHECK-NEXT: cmp w20, w19 24; CHECK-NEXT: add w20, w20, #1 25; CHECK-NEXT: b.gt .LBB0_4 26; CHECK-NEXT: .LBB0_2: // %for.body 27; CHECK-NEXT: // =>This Inner Loop Header: Depth=1 28; CHECK-NEXT: cmp w19, w20 29; CHECK-NEXT: b.eq .LBB0_1 30; CHECK-NEXT: // %bb.3: // %if.then3 31; CHECK-NEXT: // in Loop: Header=BB0_2 Depth=1 32; CHECK-NEXT: mov w0, w20 33; CHECK-NEXT: bl foo 34; CHECK-NEXT: b .LBB0_1 35; CHECK-NEXT: .LBB0_4: // %for.cond.cleanup 36; CHECK-NEXT: ldp x20, x19, [sp, #16] // 16-byte Folded Reload 37; CHECK-NEXT: ldr x30, [sp], #32 // 8-byte Folded Reload 38; CHECK-NEXT: ret 39entry: 40 %sub = add nsw i32 %px, -1 41 %cmp = icmp slt i32 %px, 1 42 %.sub = select i1 %cmp, i32 0, i32 %sub 43 br label %for.body 44 45for.body: 46 %x.015 = phi i32 [ %inc, %for.inc ], [ %.sub, %entry ] 47 %cmp2 = icmp eq i32 %x.015, %px 48 br i1 %cmp2, label %for.inc, label %if.then3 49 50if.then3: 51 tail call void @foo(i32 %x.015) 52 br label %for.inc 53 54for.inc: 55 %inc = add nsw i32 %x.015, 1 56 %cmp1 = icmp sgt i32 %x.015, %px 57 br i1 %cmp1, label %for.cond.cleanup.loopexit, label %for.body 58 59for.cond.cleanup.loopexit: 60 br label %for.cond.cleanup 61 62for.cond.cleanup: 63 ret void 64} 65